DAQ Assistant: How Can I Control this at the lowest Level?

[MrSafe]

I have updated the VI. Just need a confirmation from you. I am getting a 0.5 microsecond pulse although its actually 0.487us (at zero span with 1us sweep XD).

[Mcdan]

MrSafe,

This VI looks correct to me.  The one thing I would watch out for is the fact that you have Sample Clock Rate set via a control on the front panel.  Your data generation depends on it being set to a particular value (in your case 10 MHz).  I would consider making this a constant on the block diagram.  Leaving it as a control would invite a user to set it.  If they set it to a value that is not 10 MHz, then the generated pulses will not match the pattern they specified.

My two cents,
Dan

[MrSafe]

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Mcdan wrote:

MrSafe,

This VI looks correct to me.  The one thing I would watch out for is the fact that you have Sample Clock Rate set via a control on the front panel.  Your data generation depends on it being set to a particular value (in your case 10 MHz).  I would consider making this a constant on the block diagram.  Leaving it as a control would invite a user to set it.  If they set it to a value that is not 10 MHz, then the generated pulses will not match the pattern they specified.

My two cents,
Dan

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I agree =).

Is there any method you would suggest if I wanted the pulses to be shuffled after the user specifies how many pulses he/she wants? For example the user wants a total of 10 pulses where 5 pulses have a high time of .5 microseconds and a low time of 10 microseconds, and the other 5 pulses have a high time of 5 microseconds and a low time of 20 microseconds. Is there anyway to shuffle these pulses? I think I would have to store them then shuffle them then feed them into the loop.

[Mcdan]

MrSafe,

I gave the pulse shuffle problem a try.  For this, I assumed when you said shuffle, you mean a random shuffle so that's what I've done.  There may be more efficient ways to do this (I'm more of a DAQmx expert than I am a LabVIEW expert).  Basically I generated an array of size(totalNumberOfPulses).  Each element of this array corresponded to the index into the 'Pulse Array' which defines the high and low time for that pulse.  I then shuffled this array.  This should give me an array of pulse specs indexes in random order.  I then loop through the shuffled array, and create a pulse according to 'Pulse Array' indexed at the value read from the shuffled array.  Hopefully that description made at least bit of sense... I've attached my attempt.  I haven't had much of a chance to test this, but it seemed to be working OK.

Hope this helps,

Dan

[MrSafe]

Shoot I run labview 8.2 I believe you are running 8.5. Is there anyway I can open this vi without upgrading?

[Mcdan · Accepted solution]

MrSafe,

Sure no problem... I usually try to save back to an earlier version, but I forgot.  I fixed one issue I found with my shuffling loop (accidently indexing past the end of the array).

Here's the VI saved for LV 8.2.

Dan

[MrSafe]

Thank You. It will take awhile for me to fully grasp what you did there but I can fallow it sort of =).

I don't have other questions that I can think of I will give you a kudos and check the solution box under it. I want to thank everyone again for helping me I will post any other questions here when I think of them.